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New Alternator wiring |
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Andythefiddler 
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Joined: 16 February 2018 Location: UK Status: Offline Points: 26 |
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 Topic: New Alternator wiringPosted: 02 February 2023 at 10:45 |
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Hi All,
I'm hoping you will all tell me I've got this one right. I'm not an engineer or a mechanic, pure amateur with years of experience (both good and bad) at sea I only want the good so I talk to you good folk. My alternator gave up last year, yes really, finished the year off at 12.9V and only just able to lift the Anchor, I'm hoping the batteries (less than 1 year old) did not take any damage. I have purchased a new one, Yanmar 80 Amp this time, 60 amp is standard. I took the old one off and the back connections don't match exactly. I am making some assumptions here and I'd like anyone to comment on, have I got it right. The plug in terminal connector connects as on the old one. The bullet connector the same. The red (marked B+) goes to the batt connection Black (lighter gauge cable with insulator over) goes to the N The old unit did not have a specific earth, I am assuming I can run a fairly hefty earth to an earthing point on the Engine. There is no connection between N and the point adjacent to it - as on the old one, I suspect there shouldn't be? No photo's enclosed, Can't seem to upload them here, do we think I've got this right. Thanks Andy |
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Andy
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H8jer
Admiral 
Joined: 14 September 2010 Location: Denmark Status: Offline Points: 1503 |
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Posted: 02 February 2023 at 18:01 |
Hi please remember to downsize the pictures to 500kilobyte. I also change the stock Yanmar (Hitachi) 60Amp to a 80A hitachi like rebrand. It was 1:1 repalcement as I remember. Btw you should read the whole thread because there are many posts on altornator, belt tension, wire-thickness and more: Edited by H8jer - 02 February 2023 at 18:02 |
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Hanse 370#487 30HP 3-cabin
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Captain Cook
Admiral
Joined: 23 May 2006 Location: Denmark Status: Offline Points: 1245 |
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Posted: 02 February 2023 at 21:25 |
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Try this: Or this: I suppose that the wiring harness is the same for all the Yanmars, at least you can get an idea to where the cables go, and the colour codes. If everything fails, get a workshop manual at manualslib, I only have for the 3JH4E and 4JH engines.  A comment on the way to post photos and documents: "Quick Reply" is for text only. "Post
Reply" (Find the button on the left hand side) will give you the choice
to add a file(pdf), choose the icon to the left of the tree. The tree-icon "Insert Image" opens the opportunity to add a photo, but most photos are too large, since the limit is 256Kb. There are a lot of free programs to shrink your photo. I use ViewNX2 from Nikon. :Kjeld
Edited by Captain Cook - 02 February 2023 at 22:06 |
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Freya H400 #27 (2006),2-cabin, 40HP 3JH4E, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M603(VHF)+M802(SSB)
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H8jer
Admiral
Joined: 14 September 2010 Location: Denmark Status: Offline Points: 1503 |
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Posted: 03 February 2023 at 06:25 |
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Hi again It could also be a good idea to post which engine it is? Because both my old and new alternator had a dedicated connector for negative. Also the harness has a 10mm2 negative in a tube. Edited by H8jer - 03 February 2023 at 06:26 |
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Hanse 370#487 30HP 3-cabin
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Andythefiddler wrote: